Yes, the 4P code means "engine reinforcement" in other words the installation of the radius rod, it does not mean SS. None of the Fisher codes on a trim tag directly identify a specific engine or drivetrain component, they only identify extra work that was needed to be performed on a "base" body to prepare it for the drivetrain and other options to be installed by GM on their side of the plant. 4P just mean't that Fisher needed to install the front bracket for the radius rod, that GM would install later. Specific Engine combinations are infered by other options present on the car. For example all 4P coded cars with a powerglide transmission are always SS's, but 4P cars with a 4 speed could have either an L48, or an L30 engine depending on which transmission, Muncie, or saginaw, was installed in the car.

Yes, chevrolet would build the car to their broadcast sheets which would not have included the radius rod because the car was not ordered as an SS, but it appears that someone on the engine assembly line got one or more engines out of order, and installed a 350/295HP engine into the car. Mistakes happen, someone who ordered an SS that was being built that day, may have gotten a 327 installed in it. Does the car have SS emblems on the fenders, gas cap, grille and steering wheel? Doe it have dual exhaust, and the original brackets for a dual exhaust system?

............ None of the Fisher codes on a trim tag directly identify a specific engine or drivetrain component, they only identify extra work that was needed to be performed on a "base" body to prepare it for the drivetrain and other options to be installed by GM on their side of the plant. 4P just mean't that Fisher needed to install the front bracket for the radius rod, that GM would install later. .........

Hi Mark,

Based on your comments above, why are there specific 4P thru4 L option codes listed that do define an engine option (section 4) and tranny option (section 2)? As for the radius rod, I suspect that this may not be an engine error based on the CRG report for radius rods that states:About one-third of L48/M35 cars have been noted with the round radius rod installed, while the remainder have the rod brackets but are absent the rod. No definite installation pattern has emerged

I have to say that this particular car research is interesting indeed.

Does anyone know of one of the cars referenced on the CRG web site stating some of the powerglide SS cars came with out the traction bar?I will take some pictures of the original exhaust hangers tomorrow

Fisher did not care one bit which engine went into a car, everything engine related was installed by Chevrolet. Fisher added the parts some of the cars needed. If a car needed a 3 speed, or 4 speed transmission, fisher had to cut the hole for it, if the car was an RS, fisher had to attach the right rear tail panel and punch the correct holes for wiring and trim. As far as the 4'so, 4P literally means it got the engine reinforcement plate under the rear seat on the passenger side. 4L is engine reinforcement with Z28 stripes on the trunk panel, 4N, and 4K is an engine reinforcement and black tail panel. There is lots of discussion on why the 4K exists, but there either was supposed to be some difference between the L78 and L35 that was never implemented, such as two traction bars, or there actually is some difference in the structure of the bodies, that no one has been able to find yet. 4F is the remote mirror, which required a different hole drilled in the door to pass the cable thru. Nothing in the codes specify a specific engine. All small blocks are the same size, as are the big blocks so there would be no physical difference needed to be incorporated into the body to support one engine over the other as far as fisher was concerned.

This car could also have a fisher coding error, instead of Chevy putting the wrong engine into a non SS, in that they did not install the SS components into a car ordered that way, and chevy added all of their SS related hardware, per the broadcast sheets. Things did go awry every so often in the plant.

Great education here. As to the fenders and hood and original paint. All paint apears to be original with the exception of drivers door and left fender. Where would I look to find a date code on the fenders and hood and how is it read? IThanks Tony

OK...I forgot about the blackouts for the BB codes and the Z stripes. That makes sense now. So even though the codes themselves don't directly reference an engine combo but the work to prepare a body does indirectly reference what is to be placed in it when sent through the wall. I always thought the differences between the L35 and L78 was the the shape of the radius rod (round vs. square) but the rod evolution seems to have changed as the production run progressed and the floor plate was the same with either rod so that idea isn't valid. Otherwise I can't see any body preparation differences between the two BB's. I don't why Chevy didn't adapt the 2 radius rod setup like the Firebird.

The code is usually the week number of the year and they can be found along a flat edge somewhere. Sometimes they are lightly stamped so you have to look carefully. On my hood it was on the right side edge towards the front and the fenders along the top edge that is folded to form the water channel. The door date was behind the panel.Here is a link to more info: http://www.camaros.org/numbers.shtml#sheet

Since its an LOS car, the broadcast sheet for the GM equipment should still be sitting on top of the Fuel tank. that will answer what the car was ordered as, at least as far a Chevy was concerned. Maybe the person input the info into Fishers Scheduling system missed the L48 option, and the tag got printed without the code. Was it possible to order a non posi 12 bolt, I know you could order posi in a non SS which would sometimes require a 12 bolt axle to be installed because a specific ratio was not made in a 10 bolt configuration, and all 67 3.07 ratio axles are 12 bolts whether they are posi or not, so the axle may not have been associated specifically with an SS, it could have been ordered that way. Never know without seeing the broadcast sheet, and may never know at that point either.

It wasn't the 3.07, but the 2.73 ratio. The PE axle was a 10 bolt posi, 3.08. "The 2.73 ratio with positraction appears to have been only available with a 12-bolt axle in 1967, presumedly to reduce inventory."

I got a chance today to take some pictures of the dual exhaust. I think the head pipes are original, but I will let the experts decide. Is there any one who has a picture of how the drivers side exhaust goes back by the frame rail and attaches?